iPod nano/mini 2G use clock speed optimisation to increase battery time.VBR songs with a sudden increase in bitrate may cause the iPod nano/mini 2G to stutter as the clock speed is not increased fast enough to deal with the increased bitrate.

This has so far been observed for songs encoded with LAME --preset standard and is only true when not using the equaliser.

For Five Years the clock speed hovers around 24 jumping to 30 when the stuttering begins. Using the equaliser the clock speed hovers around 36 throughout the song and no stuttering occurs.

Further observations:- this problem is related to the iPod nano/mini 2G but one sample has been found that makes the 4G Color iPod stutter- problem with iPod mini software 1.3, 1.4, and 1.4.1- problem with iPod nano software 1.0, and 1.1- iPod mini 2G do not use optimisation when connected to a computer- iPod mini 2G do use optimisation, both when using its battery and when connected to a powered dock that is not connected to a computer- problem go away when using an EQ setting different from flat/off- only safe EQ setting to use is Bass Reducer / Treble Reducer in order to avoid distortion of songs with a high recording level- problem do not occur when using iTunes MP3 encoder- problem do not occur when LAME VBR song do not contain 320 kbps: options --preset standard -B 256- problem do not always occur at the same spot in the subtle songs listed below- iPod mini 1G clock speed for Five Years hoovers aroung 31 rising to 33 where it was 24 / 30 for the 2G- iPod mini optimisation may be turned off (I don't now how to provoke this) and require a reset of the iPod to turn it back on.- for the 4G color iPod only the sample with NIN - Right Where it Belongs stutters, even with the EQ set to Bass Reducer. Acoustic EQ setting makes the problem go away.

I have a 4G 20GB iPod and I'm pretty sure its processors change speed dynamically during playback (see this article), but I've never once encountered a stutter in the 5 months I've owned it. Almost all of my 1,500+ song library is encoded in LAME -preset-extreme via EAC.

I have a 4G 20GB iPod and I'm pretty sure its processors change speed dynamically during playback (see this article), but I've never once encountered a stutter in the 5 months I've owned it. Almost all of my 1,500+ song library is encoded in LAME -preset-extreme via EAC.

nope your iPod should do fine as well as the 1G iPod mini (even though they both shift clock speeds). There seems to be a problem with the new chips Apple uses for their recent models that need less CPU power and therefore result a longer playback time...as far as I know only 2G iPod mini and 2G iPod Photo use these new chips...

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--alt-presets are there for a reason! These other switches DO NOT work better than it, trust me on this.LAME + Joint Stereo doesn't destroy 'Stereo'

My 2G 4GB mini is filled with --aps MP3s (ripped using EAC's secure mode) and I haven't had any problems with stuttering. I listen to all kinds of different music too. I have everything from Alicia Keys to Fear Factory on my iPod, so theres a variety of complexity and types of music. Not a single song has skipped or stuttered.

I downloaded the sample posted in the other thread. So far I've listened to it about 6 times and it's played flawlessly every time. I sent it over to my friend with a 6GB 2G mini and hes had no problems with it either.

I hate to say this, but I think it's just a problem with the original poster's iPod. So far I've seen 2 iPods play it correctly that, according to the original poster, should have stuttered at least once.

My 2G 4GB mini is filled with --aps MP3s (ripped using EAC's secure mode) and I haven't had any problems with stuttering. I listen to all kinds of different music too. I have everything from Alicia Keys to Fear Factory on my iPod, so theres a variety of complexity and types of music. Not a single song has skipped or stuttered.

Most songs seems not to be affected by this problem. I'm updating the original post as I found new examples.

QUOTE

I downloaded the sample posted in the other thread. So far I've listened to it about 6 times and it's played flawlessly every time. I sent it over to my friend with a 6GB 2G mini and hes had no problems with it either.

I hate to say this, but I think it's just a problem with the original poster's iPod. So far I've seen 2 iPods play it correctly that, according to the original poster, should have stuttered at least once.

My 2G 4GB mini is filled with --aps MP3s (ripped using EAC's secure mode) and I haven't had any problems with stuttering. I listen to all kinds of different music too. I have everything from Alicia Keys to Fear Factory on my iPod, so theres a variety of complexity and types of music. Not a single song has skipped or stuttered.

Most songs seems not to be affected by this problem. I'm updating the original post as I found new examples.

QUOTE

I downloaded the sample posted in the other thread. So far I've listened to it about 6 times and it's played flawlessly every time. I sent it over to my friend with a 6GB 2G mini and hes had no problems with it either.

I hate to say this, but I think it's just a problem with the original poster's iPod. So far I've seen 2 iPods play it correctly that, according to the original poster, should have stuttered at least once.

Are you sure clock speed optimisation was in use when you played back the sample?

Clock speed optimisation was on. Infact, I even reset it just to make sure. I've been listening to both songs posted in the other thread for about the last 10 minutes or so. Constant repeat. No stuttering whatsoever.

The clockspeed generally hung around 22-28MHz for both songs. Strangely enough, I tried a 128kbps AAC song, and the clockspeed is higher at around 28-30MHz. hmm.

Clock speed optimisation was on. Infact, I even reset it just to make sure. I've been listening to both songs posted in the other thread for about the last 10 minutes or so. Constant repeat. No stuttering whatsoever.

So not all 2G mini's will stutter. I will update my original post to this new information.

QUOTE

The clockspeed generally hung around 22-28MHz for both songs. Strangely enough, I tried a 128kbps AAC song, and the clockspeed is higher at around 28-30MHz. hmm.